-- You would need at least 238,080 iPhone 6S devices with 16 gigabytes of storage. Without tax, that would cost $154.5 million altogether, and span about 21 miles in length when placed end to end. If you stacked the phones on top of one another, they would weigh more than 74,995 pounds, or about 16% of the heft of a grounded, un-fueled Boeing (BA) 747-8.